chore(docs): Updated API Reference (v2) (#8073)

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

www/apps/api-reference/specs/admin/code_samples/Shell/admin_orders_{id}_fulfillments_{fulfillment_id}_shipments/post.sh

@@ -1,11 +1,11 @@
-curl -X POST '{backend_url}/admin/orders/{id}/fulfillments/{fulfillment_id}/shipment' \
+curl -X POST '{backend_url}/admin/orders/{id}/fulfillments/{fulfillment_id}/shipments' \
 -H 'x-medusa-access-token: {api_token}' \
 -H 'Content-Type: application/json' \
 --data-raw '{
   "items": [
     {
-      "id": "id_eyih2debIPWMK4kaHGPZ",
-      "quantity": 7476297089417216
+      "id": "id_5sTwO6Lz9h9W7f1U",
+      "quantity": 395722780311552
     }
   ],
   "metadata": {}